WHY: The ham may be contaminated with listeria, an organism that can cause serious and sometimes fatal infections in young children, frail or elderly people and others with weakened immune systems. Symptoms may include high fever, severe headache, stiffness, nausea, abdominal pain and diarrhea. It may cause miscarriages and stillbirths among pregnant women.

INCIDENTS: None reported.

HOW MANY: About 5,700 pounds.

FOR MORE: Call USDA Meat and Poultry Hotline at 888-674-6854 from l0 a.m. to 4 p.m. EDT Monday through Friday.